Weird interference, every 66 Khz

[Louie1961]

I am noticing this interference on all bands from 10-160. it seems to recur every 66 Khz. It is noticeably absent above 35 Mhz. The amplitude of the interference differs among the bands being more noticeable on some. On 60 Meters it is the worse, and I actually see two different signals on the band, one spaced at 66 Khz and one very square shaped wave every 62 Khz. If I tune one of these signals it comes across as a soft white noise. It's not the worst interference as I can easily tune signals that are not right on top of one of these spikes, and they are actually quite far apart compared to the bandwidth of a typical SSB signal. Has anyone seen this and if so, what is it and how do I get rid of it

 

[W8WCA]

Some sort of local interference?

You try turning off Cable Modem - computers and network items.

Is it Always on or just sometimes?

You might also let us know your Receiver and antenna setup

 

[Louie1961]

Receiver is an SDRplay RSP1a running off the RX out on my Yaesu FTDX-3000. Antenna is a MFJ cobweb antenna mounted on the roof.

 

[Hit_Factor]

My guess is LED lighting.

 

[majoco]

I had an HP monitor that type of interference - note the past tense. Also check all of your switch-mode chargers.

 

[krokus]

Could be from a neighbor, too.

You have a fairly high noise floor, in some of those sweeps, too.